As the maintainer of FreshBSD.org, git gives me headaches regarding what to do with branch naming.
SVN and even CVS include branch information on each commit, but git couldn't care less - it's up to you to infer it by unspecified means if you really care.
It's telling that the conversion metadata includes tags indicating the SVN path identifying the branches a given commit was made from - because this otherwise wouldn't be available. In principle I can just use that, but I still need a reliable solution for new commits.
Not convinced I'll find one.